In this example you’ll learn how to use the java.time.Period class (from Java 8) to calculate difference between two dates. Using Period.between() method will give us difference between two dates in years, months and days period.

Besides using the Period class we also use the ChronoUnit enum to calculate difference between two dates. We use the ChronoUnit.YEARS, ChronoUnit.MONTHS and ChronoUnit.DAYS and call the between() method to get the difference between two dates in years, months and days.

Let’s see an example below.

package org.kodejava.example.datetime;
import java.time.LocalDate;
import java.time.Month;
import java.time.Period;
import java.time.temporal.ChronoUnit;
public class DateDifference {
public static void main(String[] args) {
LocalDate birthDate = LocalDate.of(1995, Month.AUGUST, 17);
LocalDate now = LocalDate.now();
// Obtains a period consisting of the number of years, months and days
// between two dates.
Period age = Period.between(birthDate, now);
System.out.printf("You are now %d years, %d months and %d days old.%n",
age.getYears(), age.getMonths(), age.getDays());
// Using ChronoUnit to calculate difference in years, months and days
// between two dates.
long years = ChronoUnit.YEARS.between(birthDate, now);
long months = ChronoUnit.MONTHS.between(birthDate, now);
long days = ChronoUnit.DAYS.between(birthDate, now);
System.out.println("Diff in years = " + years);
System.out.println("Diff in months = " + months);
System.out.println("Diff in days = " + days);
}
}

The result of our code snippet above are:

You are now 20 years, 5 months and 5 days old.
Diff in years = 20
Diff in months = 245
Diff in days = 7463

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